Does the word relitigate imply legal proceedings?

I understand the word, "litigate" to indicate some kind of legal action. However, I have recently come across the word "re-litigate" in a context that implies a difference of opinion that has not (yet?) become a matter for the courts.

• Is a non-legal sense of "re-litigate" common usage?

I've lived all my life in the UK, but to my recollection, I have not heard the word before.

• Is usage of the the word "re-litigate" more common outside the UK? In the US, for example?

Not a common usage, probably based on sense of litigate: (archaic) : Dispute. (M-W)

Relitigate: (transitive) To dispute, debate, contest again.

2010, Lexington, The Economist, 5 Aug 2010: Like Mr bin Laden, Mr Gingrich is apparently still relitigating the victories and defeats of religious wars fought in Europe and the Middle East centuries ago.

(Wiktionary)